Automatic stop for phonographs



Apr. 3, 1923.

F. G. MAYER AUTOMATIC STOP FOR PHONOGRAPHS Filed Nov. 28, 192] Patented Apr. 3, 1923.

FRED e. MAYER, ornIoHMoNn, INDIANA; RIGHMON'IIINDIAN'A, A o' AssIGNoit To STARRPTANO. comma. 01115.. onro'rtn'rron or.Iii)"UIANA;v I f AUTOMATIC STOP'FOR PHON-OGRAPHS.

Application filed November 28, 19221.-

provide a phonoplayed,

at any desired point in the travel of the tone arm, sound box and stylus from the outer edge of the Usually this stop is provided with an adjustable lever which is encountered by a suitable stop on the tone arm when the latter has reached a predetermined point near the center of the disk and the end of the spiral record, and which when thus en gaged, is moved and thereby trips the stop mechanism which, in some cases, throws a brake against the turn table and thereby arrests its rotation.

The invention, subject of my present application for Letters Patent, is an improvement in stop mechanisms of this character and is characterized by the special construction and mode of operation of the parts comprising said mechanism. Being specific to such mechanism, the improvement will be most readily understood from the detailed description of the drawings, which illustrate my new device which follows and with this purpose in view I now refer to said drawings which are hereto attached.

Figure 1, which is partly diagrammatic,

to shows the details of the improved stop mechanism. The phonograph, as a whole including the tone arm, is not illustrated as these parts are, or may be, ofconventional and well known form and character and require, for purposes of the present case, no special illustration or description beyond reference to such parts as are herein shown.

Fig. 2 is a sectional view of a portion of the edge of the turn table.

9 The numeral 1 indicates the usual turn table of an ordinary phonograph, the other edge of which is turned down to form a flange 2.

Under this turn table, near its outer edge,

an automatic stop for arresting thec'lisktowards the center.

Serial No. 518*,154.

the stop mechanism J properis mounted the-stationary top plate ofthe machine aridv this mechanism comprises the following 7 I parts Y A disk or metalplateB to which is piv oted'at 4% a trip lever 5, to wh i ch: is adjust 6O ablyv secured: a stop l'ever' 6, which may 'be turned by hand and set at any desired angle to the lever 5 about its pivotal' poi'nt trip dog; 8-' pivoted to the plateat" 9 and connecte-- by a spiral spring 1 0 to the' triip ea lever 5, andLamocking stop lever 11 pivotedto plate .3 at and provided-'witlr-a c'am 13 atits' endthat engages: with it bl ef. 1:

shaped portion of the edgeof the trip dog 8 Thetrip -l'ever' 5 is impelled- 120 the right? by the tension of the spring 10 and its rearward movement is limited by a fixed stop 14. It is fashioned or provided with a hooked or otherwise properly shaped portion 15 to engage a notch or shoulder 16 on the trip dog 8, and when the handle 11 is shifted to the right into the position shown by full lines, this lever 5 and the trip dog 8 are brought into engagement and locked together. The trip dog 8 contains a slot through which pr jects a pin 17 that limits its movement about the pivotal point 9.

The movement of the handle 11 to the left is checked by a stop pin 18, and the trip dog plate 8 carries a rubber stop or brake 19 in position to engage and press upon the inner face of the flange 2' when the said plate is tripped.

he manner of setting and using this device is well understood by those familiar with such mechanisms. The tone arm is turned to bring the sound box and stylus to a point in their path of movement at which it is desired to arrest the rotation of the turn table. The lever 6 is then set so as to make contact with the tone arm or a stop thereon, and the tone arm then swung to the point where the stylus rests in the groove at the outer edge of the disk.

The stop is then set or cooked by shifting the handle 11 to the full line position and thereby bringing the parts 5 and 8 into interlocking engagement. The motor is then started and the stylus following the spiral groove throws the tone arm towards the center of the disk until the stop thereon strikes the lever 6 whereupon that lever is shifted to the position shown in dotted lines able for various reasons,

with the result that the trip dog 8 is released from engagement with the lever 5 and the rubber stop or brake thrown against the flange 2 thus stopping the turn table.

The great majority of automatic stops for this purpose are not satisfactory or dependand much ingenuity has been exercised in devising forms that could be always relied upon to perform their allotted functions. The form I have herein shown and described answers all practicable requirements better than .any which have come under my observation. It is simple in construction and is of such nature that derangement of its parts or failure to properly operate are practically impossible. It is positive in its action and may or may not be used as occasion may require or suggest.

hat I claim is- 1. A stop mechanism for phonographs comprising in combination, a base plate disposed under the turn table, a trip lever pivoted thereon, a cooking handle pivoted to the plate, a dog intermediate the trip lever and cooking handle, pivoted to the plate, the edge of which is engaged by the cocking handle and adapted thereby to be thrown to bring a shoulder in its edge into locking engagement with the trip lever, a spring for maintaining such engagement, and a brake carried by the pivoted dog and adapted to be thrown by the disengagement of the said trip lever and dog and into operation to arrest the rotation of the turn table.

2. A stop mechanism for phonographs comprising in combination, a base plate disposed under the turn table, a triplever pivoted to said platen an adjustable stop lever carried by the trip lever, a cocking lever also pivoted to the base plate, a dog or plate intermediate the trip lever and cooking handle pivoted to the base plate, and having shoulders that are adapted to be engaged by the cooking lever and to engage with the trip lever respectively when said cocking lever is shifted, a brake carried by the dog to engage the turn table when the trip lever and dog are disengaged, and a spiral spring connecting the trip lever and dog.

In testimony whereof I hereto affix my signature.

FRED G. MAYER. 

